Those of you who have air horns, how do you activate them. Do you have them wired directly to the upfitter switch or do you use the upfitter switch to control a relay to select between "normal" and air horns? It's easier to wire directly to the upfitter switch, but that's a long way to reach vs. hitting the center of the steering wheel. Any comments on which way is best?

there was a thread on here where some guy hooked his up to his upfitter as a selecter between normal and air horns. it looked relatively simple and he has a video showing everything he does. its very well done. ill try and find the link

I used an upfitter/aux switch to power my compressor as a fail safe. If I have a leak in the line, I don't want my compressor constantly cycling as it will burn the compressor out. Therefore, I use the upfitter as a kill switch. If my tanks aren't holding pressure and the compressor is on for a significant amount of time, I can simply turn the switch off and kill power to the compressor. I then added a switch under the steering wheel, on the kick panel, that activates my air horn when in the "on" position or my factory horn in the "off" position. I did this because I have no idea what the legality of a train/airhorn is especially, when it is the same horn they use on fire trucks here. I used a relay for this reason. Here's some crappy cell phone pictures on my setup on y 6.4.

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